73105509 has 16 divisors (see below), whose sum is σ = 99633600. Its totient is φ = 47667840.

The previous prime is 73105499. The next prime is 73105541. The reversal of 73105509 is 90550137.

It is a happy number.

It is not a de Polignac number, because 73105509 - 2⁴ = 73105493 is a prime.

It is a super-2 number, since 2×73105509² = 10688830892298162, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73105609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28729 + ... + 31169.

It is an arithmetic number, because the mean of its divisors is an integer number (6227100).

Almost surely, 2^73105509 is an apocalyptic number.

It is an amenable number.

73105509 is a deficient number, since it is larger than the sum of its proper divisors (26528091).

73105509 is a wasteful number, since it uses less digits than its factorization.

73105509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2660.

The product of its (nonzero) digits is 4725, while the sum is 30.

The square root of 73105509 is about 8550.1759631016. The cubic root of 73105509 is about 418.1351733489.

The spelling of 73105509 in words is "seventy-three million, one hundred five thousand, five hundred nine".